Omega only work over Wifi network ?

I setup my Omega to connect direcly with my personal (home) wifi network.
In this environement I show my Omega wifi-network aviable on my computer and can connect to it :)
But, without this wifi (home) aviable, I dont show the Omega (in my wifi list) :(
So, the omega is wifi (home setup) dependent ?
I cant use it in an other environement (without using the wifi-setup to re-configure it) ?

Great !
Yes I can use serial and it's great to fix it :
with a new wifisetup // every time I am on a new location // neer to a new wifi connexion...
But, if the Omega is not connected to Internet (local wifi) the omega is not accessible ?
It seem strange for me, it's an OpenWrt systeme...
so, if I want to make an automatic hotspot (local one) I need to install an PirateBox
(something like this) ?
thx

You can configure it as AP (Access Point) so you don't need a extra wifi. It just not will work as a DHCP Server resp. you would have to configure for it. You can even give a extra IP as you like. Standard is 192.168.3.1.

If you put this in the Browser you will get a Control Panel to configure it for AP.